Thermal conductivity system LAMBDA

The Thermal conductivity system LAMBDA

The LAMBDA system is a compact, operator-friendly measuring instrument that facilitates a fast determination of thermal conductivity in a wide temperature and pressure range by means of the hot-wire method according to ASTM D2717. It is suited for fluid analysis in the laboratory as well as in the field, including the measurement of thermal conductivity of dispersions of nanoparticles (nano-fluids). The LAMBDA can be operated in the stand-alone mode or by any personal computer since it is equipped with a digital interface RS 232.

Key features

  • Wide measuring range (10 - 2.000 mW/(m*K))
  • Thermal conductivity and temperature are displayed
  • Fast, instationary resistance measurement by means of the hot-wire method
  • No unwanted influence of convection
  • Suitable for any fluid, powder or gel
  • Only small amount of fluid sample needed (approx. 35 ml)
  • High reproducibility (98 – 99 %)
  • Short set-up time
  • Easy to operate
  • Optional connection to a computer for fully automatic measuring and temperature control


Fields of application

For determining the thermal conductivity by means of the LAMBDA a small fluid sample of approx. 35 ml is sufficient. The sensor is simply immersed into the measuring fluid and in intervals of approx. 60 seconds the LAMBDA determines the thermal conductivity as well as the temperature of the fluid. The compact measuring instrument opens up new possibilities for the flexible application in laboratory or field:

  • Optimizing of fluid development
    Development of working fluids for heat transfer and isolation
  • Optimizing of fluid application
    Solving problems of heat transfer in process application
  • Quality control
    Quality control of incoming / outgoing liquids
  • Fluid analysis in the field
    Optimizing of service and maintenance intervals


Technical data

Power supply110-240V 50/60Hz
Energy consumption15W
Sensor output
smaller 10mW
Repeatability98 – 99%
Measuring range0,01 – 2 W/(m*K)
Measuring mediafluids, gels, powders
Temperature range-20°C – 150°C (optional HT version up to 300°C available)
Temperature accuracy± 0,1°C
Temperature measurementPT100
Response timeca. 60 s
Optional data transfer to a computerRS232 interface
Zero offsetautomatic
Dimensions electronic unit (LxWxH)350 x 260 x 160 mm
Weight electronic unitapprox. 2,9 kg

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